Recognition Properties and Self-assembly of Planar [M(2-pyridyl-1,2,3-triazole)2 ]2+ Metallo-ligands

Dan Preston; James A Findlay; James D Crowley

doi:10.1002/asia.201801132

Recognition Properties and Self-assembly of Planar [M(2-pyridyl-1,2,3-triazole)₂ ]²⁺ Metallo-ligands

Chem Asian J. 2019 Apr 15;14(8):1136-1142. doi: 10.1002/asia.201801132. Epub 2018 Sep 20.

Authors

Dan Preston¹, James A Findlay^{1

2}, James D Crowley^{1

2}

Affiliations

¹ Department of Chemistry, University of Otago, PO Box 56, Dunedin, 9054, New Zealand.
² MacDiarmid Institute for Advanced Materials and Nanotechnology, New Zealand.

PMID: 30144280
DOI: 10.1002/asia.201801132

Abstract

Molecular recognition continues to be an area of keen interest for supramolecular chemists. The investigated [M(L)₂ ]²⁺ metallo-ligands (M=Pd^II , Pt^II , L=2-(1-(pyridine-4-methyl)-1 H-1,2,3-triazol-4-yl)pyridine) form a planar cationic panel with vacant pyridyl binding sites. They interact with planar neutral aromatic guests through π-π and/or metallophilic interactions. In some cases, the metallo-ligands also interacted in the solid state with Ag^I either through coordination to the pendant pyridyl arms, or through metal-metal interactions, forming coordination polymers. We have therefore developed a system that reliably recognises a planar electron-rich guest in solution and in the solid state, and shows the potential to link the resultant host-guest adducts into extended solid-state structures. The facile synthesis and ready functionalisation of 2-pyridyl-1,2,3-triazole ligands through copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) "click" chemistry should allow for ready tuning of the electronic properties of adducts formed from these systems.

Keywords: metallo-ligands; molecular recognition; palladium(II); platinum(II); π-π interactions.